Android Question AndroidX support.v7 does not exist error

[Multiverse app]

After upgrading to AndroidX, all of my projects have broken.
This is the error in the latest project:

B4A Version: 9.30
Java Version: 8
Parsing code.    (0.48s)
Building folders structure.    (0.01s)
Compiling code.    (2.55s)
Compiling layouts code.    (0.17s)
Organizing libraries.    (0.00s)
    (AndroidX SDK)
Generating R file.    (2.02s)
Compiling debugger engine code.    (7.57s)
Compiling generated Java code.    Error
javac 1.8.0_181
src\com\multiverse\jarvis\starter.java:3: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatDelegate;
                             ^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

These are the imports

The Additional lib folder is located in "C:\B4A"
All the latest SDKs are installed.

Were there any additional steps i had to take while upgrading to AndroidX? I followed this tutorial.

 

[Multiverse app]

After going through this answer, I replaced

#Extends: android.support.v7.app.AppCompatActivity

with

#Extends: androidx.appcompat.app.AppCompatActivity

Now I get this error:

B4A Version: 9.30
Java Version: 8
Parsing code.    (0.42s)
Building folders structure.    (0.01s)
Compiling code.    (2.28s)
Compiling layouts code.    (0.05s)
Organizing libraries.    (0.00s)
    (AndroidX SDK)
Generating R file.    (1.82s)
Compiling debugger engine code.    (5.31s)
Compiling generated Java code.    Error
javac 1.8.0_181
src\com\multiverse\jarvis\starter.java:3: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatDelegate;
                             ^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

 

[Almora]

https://www.b4x.com/android/forum/threads/notificationbuilder-androidx-issues.107345/#post-671190

 

[Erel]

Start with this example: https://www.b4x.com/android/forum/threads/appcompat-with-toolbar-minimal-example.79896/#content
It should work without making any changes.